[R] How to menage decimals in order to obtain accurate estimates

[mary]

I'm sorry,

I have a data set  contains numbers with more decimal places, the data are
available in R "data (milk)".
I made a loop to get a robust correlation matrix but in  calculations,
decimals cause me problems ( especially I do not know how R rounds numbers
by default) so the diagonal should be equal to one is not.

I hope it's clearer.



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